jax.numpy.rollaxis

jax.numpy.rollaxis(a, axis, start=0)

Roll the specified axis backwards, until it lies in a given position.

LAX-backend implementation of numpy.rollaxis().

The JAX version of this function may in some cases return a copy rather than a view of the input.

Original docstring below.

This function continues to be supported for backward compatibility, but you should prefer moveaxis. The moveaxis function was added in NumPy 1.11.

Parameters

• a (ndarray) – Input array.

• axis (int) – The axis to be rolled. The positions of the other axes do not change relative to one another.

• start (int, optional) –

  When start <= axis, the axis is rolled back until it lies in this position. When start > axis, the axis is rolled until it lies before this position. The default, 0, results in a “complete” roll. The following table describes how negative values of start are interpreted:

  start	Normalized start
  -(arr.ndim+1)	raise AxisError
  -arr.ndim	0
  ⋮	⋮
  -1	arr.ndim-1
  0	0
  ⋮	⋮
  arr.ndim	arr.ndim
  arr.ndim + 1	raise AxisError

Returns

res – For NumPy >= 1.10.0 a view of a is always returned. For earlier NumPy versions a view of a is returned only if the order of the axes is changed, otherwise the input array is returned.

Return type

ndarray